Abstract
Acidity of the oxidic molybdenum catalysts supported on mixed ZrO 2–SiO 2 and ZrO 2–Al 2O 3 carriers was investigated by Fourier transform infrared spectroscopy of pyridine adsorption. Deposition of molybdenum on ZrO 2–SiO 2 and ZrO 2–Al 2O 3 supports leads to formation of surface Brønsted acid sites. The number of the Brønsted and Lewis acid sites in supported-molybdenum catalysts depends on both the ZrO 2 content and the type of the support. With increasing ZrO 2 content, the Lewis acid sites increase for both series of catalysts. The Brønsted acid sites are higher for Mo/ZrO 2–SiO 2 samples compared to those for Mo/ZrO 2–Al 2O 3 and also increase with zirconia.
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